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[SOLVED] Migration from Exchange to Zimbra very slow

Posted: Wed Dec 12, 2018 6:09 pm
by fs.schmidt
Hi,

Has anyone done any migration recently from Exchange to Zimbra using the Migration Tool?

We are trying to migrate a customer of us from Exchange and the Zimbra migration tool is very slow. I mean, it's taking about 40 minutes to migrate an account with just 300mb and 6000 items.

We couldn't find any bottleneck. CPU, RAM, I/O, and NETWORK performance/sizing are OK.

Re: Migration from Exchange to Zimbra very slow

Posted: Tue Dec 18, 2018 6:42 pm
by fs.schmidt
Hi,

Just to report if anyone faces the same issue: The bottleneck was the Exchange throttling policy that is enabled by default.

We were able to increase a lot the performance by disabling it for the admin user used for the migration:

https://help.bittitan.com/hc/en-us/arti ... -Exchange-

https://docs.microsoft.com/en-us/previo ... v=exchg.80)